APC communication error message

I just installed an APC UPS ES750 battery for my computer. I keep getting a windows message (Unable to communicate with battery message) I use XP PRO and I have down loaded the latest version of the communication software from APC, I replaced the APC unit with another new one, I replace the USB cable, I have run numerous self tests that show that the computer and battery are communicating, I can get monitoring info from the battery when I click on that function of the APC software. Everything seems to be working fine but it is very annoying to have this message pop up every few minutes. This message pops up in a yellow box in the lower right hand corner of my screen. can you help?

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The APC UPS communicates with the computer using a data cable that has a RJ45 connector at the APC and a USB connector at the computer. This data cable and communication software CD is available from APC.Go to this APC WEB site for a manual for your model UPS.http://www.apcmedia.com/salestools/KBOK-7A3TGR_R0_EN.pdf

First, you have the COMCAB which is an APC UPS communication cable ca. 2m length, for communication between APC UPS and PC/Server . Another type is the AP9870-BD.This extension cable for connecting hardware to a UPS up to 10 A, 2 m length, ident. APC AP9870.AP9875-BD Power cable used for connecting a UPS to the power grid up to 16 A, 2 m length, ident. APC AP9875. There are few other types of cables as well.

If the UPS display is indicating runtime at 6 mins, and software is saying insufficient, seems like a communications issue. I'd try downloading the latest communication software for the UPS and reseating the communications cable at both ends, making sure no bent pins, etc. could be causing a comm glitch.

Make sure that the battery communication cable is connected the the battery output communication of your smartcell. If Im not wrong maybe you connect the communication cable on the input of the smartcell communication board.

You will get that message when the communications cable is not hooked up. It looks like a phone line and daisy chains from one battery to another and ends at the Matrix Control unit. If you have those installed and it still says no communication the system need service.

If you have a volt meter you can check the voltage from each battery at the plug. It should be 48 volts or more, usually on a fresh battery pack it will read 54.0+ volts.

Plz check your computer without ups.If it is runing there.And wattage of ups .It seem over load or shortage of ups.Check power cable.
Hope this be of initial help/idea. Pls post back as requested, how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FIXYA.

Here is an answer I got from APC when one of my client got the same problem as you did:

The error message would pop up if the link between the computer and the UPS is weak. I cannot rule out a problem with the cable or the UPS. In order to confirm the same please try the following steps which might help :

1) Ensure that the USB cable is properly connected to the USB port of the computer.

2) If the PC was powered on before the UPS, communication will not be achieved until you disconnect and reconnect the USB cable to the host. In this case, you need to disconnect and reconnect the USB cable to establish communication.

3) Some other software is polling your USB port for another device, thus causing the UPS software to temporarily lose communication with your UPS. If this is the case, you would need to shut down that application.

4) If you have any other USB devices connected to the PC, disconnect them and then try plugging in the cable.

If the issue persists, please visit the following link which lists few troubleshooting steps :